Two-cylinder two-cycle internal-combustion engine.



c. E. FREDERICKSON.

TWO CYLINDER TWO CYCLE INTERNAL CQMBUSTION ENGINE.

APPLICATION man MAR. 30. 1914.

Patented Nov. 30, 1915.

3 SHEETS-SHEET WIN SSES: I 0 M C, FREDERICKSON. TWO CYLINDER TWO CYQLE INTERNAL'CQMBUSUON ENGINE. APPLICATION nuan' mm. 30. 1914.

1,162,345, Patented Nov. 30, 1915.;

3 SHEETS-SHEET 2- \\\\\\\\\\\\\\\\\m\\\\\\\\\\\\\\\\\\ I M WITNESSES: l/VVEIV r01? A TTORNEYJI c. E. FREDERIDCKSON.

TWO CYLINDER TWO CYCLE INTERNAL COMBUSTION ENGINE.

' APPLICATION map MAR. 30. 1914.

1,162,345. Patented Nov. 30, 915.

3 SHEETS-SHEET 3- UNITED srrAtrEsT PATENT oFFIc CLAYTON E. FBEDERICKSON. or CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF T10 GitAcE c. STENGER, or CHICAGO, ILLINOIS.

TWO-CYLINDER TWO-CYCLE INTERNAL-COMBUSTION ENGINE.-

Specification of Letters Patent.

Application knee March 30,1914. Serial No. 328,289.

Two-Cylinder flwo-Cycle. nterna l-( ombusspecification. I

My lnvention is a two cylinder two cycle i a full and efi'ective cooling of the working.

tion Engines, of which the following is a cross port engine of the type wherein the compressed new charges formed in one cyl-' inder pass into the working chamber of the other cylinder and the invention primarily has for its object to provide an internal combustion engine in which .the parts are so arranged'and designed as provided, first, for

cylinder and piston, second, for feeding into the working chambers untouled new charges, third, ,for the use of a looser piston without danger of fouling the new charges due to oil leaks or burnt mixtures passing the piston, and fourth, for the use of cooler new charges than can beformedby making the compression cln niber inthe working cylinder proper.

Again it is the object of the present invention to so design the engine -as to em body simplicity and economy of manufacture while. maintaining a relatively high degree of ellicieney, and to provide an engine that is of light weight and has but few parts which are liable to become wornor injured or require replacement after long service.

With other objects in view which will be.

clear to those skilled in the art, the invention also resides in those novel details of construction, combination and arrangement of parts, all of which will be first fully described and then be specifically pointed out in the appended claims, reference being had to the accompanying drawings, in which Figure 1 isa side elevation and part vertical longitudinal section of the engine lookingfrom the-exhaust side. Fig; 2 is a ver- '-tical longitudinalsection on the line 22 of Fig.1. Fig. 3' is a detail side elevation of the engine, showing the arrangementof the intake manifold. Figs. 4' and 5 are diagrammatic views of the engine showing the operation of same. y I I Referring now to the drawings, 1n which like numerals of reference indicate like parts in all-of the figures, 1 represents the crank :ase and enginebed the same'having a manhole cover 25 on the bottom over the opening 2 and adapted to contain oil which is splashed by the spoon 2+ to the moving paa'ts within the crank case chamber.

vlhe crank case isprovide'd with two-cylnder holes (3 to receive the pumpingcylmder sections l, whose flanges rest on the crank case 1. The. upper end of each cylin- 'der section r is shouldered as at 7 to form a seat ior the lower ends of the working cyl-.

inders 25, and the upper ends of the pumping cylinder sections t are provided with a. transverse partition 8 and a bearing neck 9 to contain the packing 11 through which the piston rod passes, a suitable cap' 10 being provided as indicated for retaining the packing in place.

12 is the. pumping piston which is pro- -vided with suitable rings 13 and with a.

central dome like portion 14, the upper end of which is closed by the screw plug 16 and flange 17 of the piston rod 15.

1b is the pin carried by the plug 16 on which-the connecting rod 19 is mounted the connecting rod 19 having a split bearing 23 Patented Nov. 30, 191.5.

to engage the crank 22 of the crank shaft 20 and the cap of the split bearing 23 carries the spoon 24.

The working cylinders 25 each are-provided with cooling fins 2(3'that embrace the cylinder from end to end and over the head,

the head containing the compression space i 27 as usual.

1he,wo rking cylinder 2:") is divided into two'chambers bv the workin lston 52 the u )er chamber benu the workin chamber and the lower chamber the coolingor air.

chambeiz I y 28 and 4H designate the piston controlled inlet and exhaust ports respectively of" the working cylinder. The working cylinder is also provided near its lower end with a set of air ports 58 serving as vents for the air 'or cooling chamber.

The pun'iping c' \-'linder sections 4 are provided with inlet ports 40 andfoutlet ports 31 the ports 31 leading into the'ducts which connect the said ports with the inlet-ports 28 of the opposite working cylinders; The ducts 29 have their entrant ends provided with av chan'iber 39. having a. valved passage formed by the valve seat 37 and valve 33, the seat 37 being removable through the covered opening 39 as is also the valve 33 and its spring 36, the valve 33'being a check valve and having its stem 3% slidable iii the socket 85. The chamber 30 of the. valved entrance of the duct delivers througli the duct 29 into the inlet port 28 of the opposite working cylinder The inlet ducts 40 of the pump cylinder sections -1 deliver into a. valve chamber 41 that is-provided with a valve seat 42 and check valve 43 the stem 44 of the valve 13 being sli-dable in the socket 45, while the valve is pressed by the spring 46, to its seating position. The intake manifold, from the carbureter, is coupled to the casings =11 as clearly indicated in the drawings.

- Each working cylinder 25 is formed with bearings 21 and is provided with the usual fly wheel 60 and the cylinder sections 25 and 4 are bolted together into the crank case by bolts 59 best-shown in Fig. 1 of the drawings.

In operation on the" down stroke of the pistons the air from the air chamber of the cylinder 25 is expelled through openings 58 and a new charge is drawn into the pumping chamber above the piston 12 from the intake manifold. On the up stroke of the pistons the charge of working agent above the piston 12 is being put under its initial compression and forced into the duct 29 so that as soon as the port 28 of the piston cylinder 25 is open this initially compressed mixture will be forcedinto the working chamber of the opposite cylinder to expel the old charge and recharge the cylinder.

While the new. charge is being compressed above the piston 12 a new charge that has been pumped into the workingcylinder above that piston is being compressed by I the piston 52 to its filial compression. lVhen the parts arrive at the position indicated in Fig. 2 the charge in the compression space '27 will be ignited to impel the piston on its down stroke and consequently impel the other parts that move therewith.

into the ports 58 to cool the piston and the working cylinder 25 and also the bearing for the piston rod 15. In the manner described, an effective cooling of the piston and working cylinder is obtained and also the cooling of the piston rod hearing.

The rod 15 is projected On the up stroke of the piston 52 air is drawn I also call attention to the fact, that in the present design the diameter of tlie pump cylinder 4 made slightly greater than that of the working cylinder whereby to in-' sure an ample charge of fresh working agent being pumped into the working chamber of the engine. I

Any approved ignition system may be employed and any approved lubricating system, for lubricating the working piston and I have therefore not specifically disclosed any such lubricating means.

From the foregoing description taken in connection with the accompanying draw-.

ings, it is thought the complete construction, operation and many advantages of my invention will be readily understood by those skilled in the art to which .the inven' vents in communication with the cooling chamber, connections between the working, pistons and their respective pump pistonsf said cylinders each having intake and exhaust ports, an intake manifold coniinuni-i eating with the intake ports of the pumping cylinders, and cross-port ducts between the exhaust ports of the pumping cylinders and:

the intake ports of the working cylinders.

2. In an internal combustion engine of the type stated, a crank case, a crank shaft mounted therein, said crank 'ase having cylinder receiving bores, flanged pumping cylinders set into said bores, said cylinders being open at the crank case ends and having closure webs and bearings at their outer ends, separate working cylinders set on and supported over the closed ends of said pumping cylinders in axial'alinementivith the same, means for cooling said working cylinders, said cooling means inchidingheat radiating elements and air ports for admitting air into said working cylinders. beneath the working pistons, pumping pistons in said pumping cylinders. working pistons in said working cylinders. piston rods connecting said pistons, and passing through said web bearings, connecting rods between said cranfk shaft aiid said pumping pistons, said pumping cylinders having inlet and outlet ports, said working cylinders having inlet and exhaust ports, cross-ducts coi'mccting the outlet ports of said pumping cylinders and the intake ports of said working cylinders.

3. In an internal combustion engine of the type stated,'a crankcase, a crank shaft mounted therein, sa1d crank case having cylinder receiving bores, .flanged pumping cyl' inders set into said bores, said cylinders being open at the crank case ends and havlng closure webs and bearlngs at their outer ends, Working cylinders set on the closed ends bf said pumping cylinders in axial alinement with the same, pumping pistons in said pumping cylinders, Working pistons in said working cylinders, piston rods con; necting said pistons, and passing through said web bearings, connecting rods between said crank shaft and said pumping pistons, said pumping cylinders having inlet and outlet ports, said working cylinders having inlet and exhaust ports, cross-ductsconnecting the outlet ports of said pumping cylinders and the intake ports of said working cylinders, each of said ducts including a valve chamber and a back check valve in said chamber, means for cooling said working cylinders, sa1d cooling means including heat disbursing elements and air ports for admitting air into the cylinders beneath the Working pistons.

4. In an mternal combustion engine of the type stated, a crank case, a crank shaft mounted thereinf faid crank case having cyl inder receiving l o'res, flanged pumping cvlinders set into said bores, said cylinders being open at the crank case ends and having closure webs and bearings at their outer ends, working cvlinders set on the closed ends of said pumping cylinders in axial alinement with the same, pumping pistons in said pumping cylinders, working pistons in said working cylinders, piston rods cennecting said pistons, and passing through said web bearings, connecting rods between said crank shaft and said pump ing pistons,

said pumping cvlinders having inlet and outlet ports, said working cylinders having inlet and exhaust ports, cross-ducts connecting the outlet ports of said pumping cylinders and the intake ports of said working cylinders, each of said ducts including a valve chamber and a back check valve in said chamber, said working pistons dividing the respective cylinders into two chambers one of which forms the working chamber, and the other forms an air chamber, said working cylinders having air vents for said air chambers. r

5. In an internal combustion engine of the type stated, a crank case, a crank shaft mounted therein, said crank case having cyl- Copies of this patent may be obtained for inder receiving bores, flanged pumping cylinders set into saidbores, said cylinders being open at the crank case ends and having closure webs and bearings at their outer ends, working cylinders set on the closed ends of said pumping cylinders in axial alinement with the same, pumping pistons in said pumping cylinders, working pistons in said working. cylinder", piston rods connecting saidpistons, and passing throughsaid web bearings. connecting rods between said crank shaft and said pumping pistons, said pumping cylinders having inlet and outlet ports, said working cylinders having inlet and exhaust ports, cross-ducts connecting the outlet ports of said pumping cylinders and the intake ports of said working cylinders, each of said ducts including a valve chamber and a back check valve in ,said' chamber, said working pistons dividing the respectivecylinders into two chambers one of which forms the working chamber,-

and the other forms an air chamber, said working cylinders having air vents-for said.

air chambers and cooling fins on said Working cylinder around both of the chambers thereof. 7

6. In an internal combustion engine of the type stated, a crank case, a crank shaft mounted therein, said crank case having cylinder receiving bores, flanged pumping'cylinders set into said bores, said cylinders be ing open at the crank case endsand having closure webs and bearings at their outer ends, working cylinders set on the closed ends of said pumping cylinders in axial alinement with the same, pumping piston-- 1n sa1d pumping cylinders, working p stons ing cylinder having air vents for said air chamber.

CLAYTON E1 FREDERICKSON. Vitnesses:

J NO. A. CONRAD, W. H. STEXGER,

five cents each, by addressing the ,Commissioner of Patents. Washington. D. C. 

